Rigrodsky & Long, P.A. announces that it is investigating potential legal claims against the board of directors of OM Group, Inc. ("OM" or the "Company") (NYSE: OMG) regarding possible breaches of fiduciary duties and other violations of law related to the Company's entry into an agreement to be acquired by funds managed by affiliates of Apollo Global Management, LLC ("Apollo") (NYSE: APO).

Under the terms of the agreement, shareholders of OM will receive $34.00 in cash for each share of OM they own.

The investigation concerns whether OM's board of directors failed to adequately shop the Company and obtain the best possible value for OM's shareholders before entering into an agreement with Apollo. According to Yahoo! Finance, at least one analyst has issued a price target for OM stock at $37.00 per share.

If you own the common stock of OM and purchased your shares before June 1, 2015, if you have information or would like to learn more about these claims, or if you wish to discuss these matters or have any questions concerning this announcement or your rights or interests with respect to these matters, please contact Seth D. Rigrodsky or Gina M. Serra at Rigrodsky & Long, P.A., 2 Righter Parkway, Suite 120, Wilmington, DE 19803, by telephone at (888) 969-4242; by e-mail to info@rl-legal.com, or at: http://rigrodskylong.com/investigations/om-group-inc-omg.